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A new sensitive and specific enzyme-linked immunosorbent assay for IgD
David E Mosedale1, Manjinder S Sandhu, Jian'an Luan
1Translational Research Unit, Papworth Hospital NHS Trust, Papworth Everard, Cambridge Cambs CB3 8RE, UK. david.mosedale@papworth.nhs.uk
Journal of Immunological Methods
|May 23, 2006
Summary
A new Enzyme-Linked Immunosorbent Assay (ELISA) precisely measures Immunoglobulin D (IgD) levels. Circulating IgD concentrations vary by sex, age, and smoking status, necessitating controls in future research.
Area of Science:
- Immunology
- Biochemistry
- Clinical Chemistry
Background:
- Immunoglobulin D (IgD) plays a role in immune responses but its serum levels and influencing factors are not fully characterized.
- Accurate quantification of IgD is crucial for understanding its physiological and pathological roles.
Purpose of the Study:
- To develop and validate a highly sensitive and specific Enzyme-Linked Immunosorbent Assay (ELISA) for quantifying circulating Immunoglobulin D (IgD) in human serum.
- To investigate the influence of age, sex, and smoking on serum IgD levels in a general population.
Main Methods:
- Development of a novel, highly specific ELISA for IgD with a detection limit of 30 pg/ml.
- Assay validation included specificity (>10,000-fold), linearity, recovery (approx. 100%), and precision (intra-assay <10%, inter-assay <15%).
- Serum IgD levels were measured in 480 unselected patients; demographic and smoking data were collected.
Main Results:
- The validated ELISA accurately quantified serum IgD across a wide range (<300 pg/ml to >100 µg/ml), with a geometric mean of 8 µg/ml.
- Serum IgD levels were significantly higher in men than in women.
- A negative correlation between IgD levels and age was observed in women. Male smokers exhibited higher IgD levels than non-smoking males, independent of age.
Conclusions:
- The developed ELISA is a reliable tool for measuring serum IgD.
- Age, sex, and smoking are significant factors affecting circulating IgD levels.
- Future studies investigating IgD should control for these demographic and lifestyle variables to ensure accurate interpretation of results.